Binocular-telescope



K; A, EDSTROM.

BINOCULAR TELESCOPE.

. APPLICATION FILED AUG.14, 1918.

1,346,308. Patented July 13,1920.

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KARL A. EDSTROM, OF DENVER; COLORADO, ASSIGNOR 0F ONE-HALF ro THE WEISS INSTRUMENT COMPANY, A CORPORATION OF COLORADO.

Specification of Letters Patent.

IBINOGULAR-TELESCOPE.

Patented July 13, 1920.

Application filed August 14, 1918. Serial No. 249,799.

1/ b all whom it may concern."

lie it known that I, KARL A. Ensrnonna citizen of the United States, residing at Denver, in the county of Denver and State of Colorado, have invented certaih new and useful Improvements in Binocular-Telescopes, of which the following is a specification.

This invention relates to binocular telescopes of the type in which two objective casings have a hinged connection for the purpose of varying their pupilary distance.

The present invention relates more particularly to the construction of the hinge by which the casings of the binoculars are relatively adjustably connected, and its primary object is to provide a hinge connection which includes a single adjusting screw by means of which the two joints at opposite ends of the casings may be simultaneously adjusted for the purpose of varyin the frictional engagement of their constituent parts.

By the use of my invention this adjustment of the joints which constitute the hinge-connection between the two casings is simplified to the extent that persons unskilled in the art may regulate their movement by adjustment of a single readily accessible part.

lVith the above and other objects in view, all of which will fully appear in the course of the following description my invention consists of the construction and arrangements of parts hereinafter described and fully shown in the accompanying drawings in which similar characters of reference refer to corresponding parts throughout the several views and in which- Figure 1, is a sectional elevation of a binocular constructed in accordance with my invention,

Fig. 2, a section on the line 2-2, F1g. 1,

Fig. 3, an enlarged fragmentary section of the rear joint of the hinge-connection taken on the line 33, Fig. 2, and

Fig. 4, an enlarged face view of the index cap which is a part thereof.

Referring more particularly to the draw ings, the reference numerals 5-5 designate the two objective casings of a binocular telescope, which have a hinged connection for the purpose of varying the distance between their eye-pieces 6 in accordance wlth the pupilary distance between the eyes of the user.

The hinge-connection is composed of two oints at opposite ends of the casing which are each provided with a pair of laterally extending arms 7. The corresponding arms of the casings have at their free ends reversely offset centrally apertured diskshaped knuckles 8 which when the two casmgs are assembled provide two axially alined flush joints.

A distance sleeve 9 is placed between the two pairs of arms with its bore in alinement with the apertures of its knuckles, for the purpose of providing a solid support for their inner members when by adjustment of the screw hereinafter to be described the corresponding outer members are moved into frictional contact therewith.

Two bushings l0 and 12 are fitted in the alined apertures of the two pairs of hinge knuckles to provide bearings upon which the inner ones turn when the two casings are adjusted with relation to each other.

The bushing 10 associated with the for ward joint of the hinge-connection has an integral head which liesfiat against the outer surface of the outer knuckle and is rigidly secured thereto by a dowel 13 extending in registering apertures of the adjoining parts.

The-bushing 12 which occupies the alined apertures of the knuckles at the rear joint, has a flange which engages the outer surface of the outer knuckle and which has a peripheral indentation to receive a dowel 14 projecting from the knuckle for the purpose of securing the bushing against independent rotation.

It will thus be seen that when the two cas-- ings are adjusted by a movement about their pivotal axis, the arms on the one move upon the bushings which are fixed on the arms of the other.

The headed bushing at the forward joint has an internal screw-thread cooperating with the threaded extremity of the adjusting screw 15 which is inserted through the alined bores of the other bushing and the distance sleeve.

The screw has a round head 16 which occupies a countersink in the flanged end of the bushing 12 and which has the usual slot to receive the bladeof a screw-driver. The outer face of the screw-head is flush with the outer surface of the flange of the bushing and the two parts are covered by an index cap 17 which is secured to the adjusting screw by'means ofa' small bevel-headed screw 18.

The cap 17 has in the inner surface of its rim a recess to receive the outer half of the dowel 14: which partially occupies the inden tation in the flange of the bushing 12 so that boththe cap and the. bushing are held against rotation on the outer knuckle of the respective jointofthe hinge-connection; V

Theindex cap bears upon a bevel-face 19 a graduatedscale 20 which registers with a mark 21011 the outer arm of the respective joint to indicate the pupilarydistance between the two eye-pieces of the telescope;

It will be seen that by adjustment of the screw in thebushing 10 which in this respect performs the function of a nut,rthe frictional contact between the members of the two hingejoints may be varied at will to regulate th'emovement of the casings of the binocular, that the screw is readily accessible for adjustment by removing the in- V deX cap and that the latter in addition to its joints and providing a bearing for the other member ofthe same, a smooth-,bored bushmg turning with one of the members of the other joint and forminga bearing for'the other member of the same, and'a screw bearing upon the last-mentioned bushing and having a threaded end within the other.

2. In a binocular telescope, the conibination of a pair of casings having ahinge-connection including two axially alined joints,

an' internally threaded bushing turning with one of the members of one the joints, and providing a" bearing for the other member of the same, a smooth-bored bushing turning with one of the members of the.

other joint and forming'a bearing for the other member of the same, a distance-sleeve between the joints, and a headed screw passing through the last-mentioned bushing and the dlstance-sleeve and havmg a threaded end'within the other bushing.

3. in a binocular-telescope, the combination of a pair of casings having a hinge connection including two axially alined joints, an internally threaded bushing turning with one of the membersof one of the joints and providing a bearing for the other member of the same, a smooth-bored bushing hav' ing a countersing turning with one of the members of the other joint and forming a bearing for the other member of the same a screw having a head within the counter- V sink of the last-mentionedbushing, and a threadedend within the other bushing, and a cap fastened upon the head of the screw.

In testimony whereof I have a'llixed my signature.

KARL A. 'EDsTnoM. 

